ARM: dts: qcom-msm8974*: Fix UART naming

It's either uart10, or blsp2_uart4, not blsp2_uart10, as there aren't 10
UARTs on BLSP2. Fix the naming to align with what's done in arm64/qcom.

Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220415115633.575010-4-konrad.dybcio@somainline.org